实体框架和ASP.NET MVC 2：即时选择数据库实例

I'm currently working on an ASP.NET MVC 2 project which needs several instances of the same SQL Server 2008 R2 database (One in production using SQL Replication, the others being it's development counterpart, allowing schema updates and testing of our applications locally before production release, one instance with SQL Replication on, another one without it).I'm currently working on an ASP.NET MVC 2 proje